Pipe-wrench



G. P. SHAW.

PIPE WRENCH.

Patented- Jan. 6, 1891.

(No Model.)

UNITED STATES PATENT OFFICE.

GEORGE F. SHA\V, OF DEDHAM, ASSIGNOR OF ONE-HALF TO CHARLES G- SMITH ANDBENJAMIN F. SMITH, OF SOMERVILLE, AND GEORGE G. PROCTER, OF BOSTON,MASSACHUSETTS.

PIPE-WRENCH.

SPECIFICATION forming part of Iietters Patent No. 444,255, dated January6, 1891,

Application filed October 6, 1890. Serial No. 367,229. (No model.)

To all whom it may concern:

Be it known that I, GEORGE F. SHAW, a citizen of the United States, anda resident of Dedham,in the county of Norfolk and State oflvlassachusettshave invented new and useful Improvements in Piperenches,of which the following, taken in connection with the accompanyingdrawings, is a specification.

This invention relates to improvements in lo pipe-wrenches, and it iscarried out as follows, reference being had to the accompany ingdrawings, where- Figure 1 represents a side elevation of the improvedwrench, showing a pipe grasped and held between its jaws. Fig. 2represents a similar side elevation showing the jaws expanded. Fig. 3represents a rear view, aportion of which is shown in section; and Fig.4 represents alongitudinal section on the line X X, shown in Fig. 3.

Similar letters refer to similar parts wherever they occur on thedifferent parts of the drawings.

The invention consists of a handle A, having pivoted to its upper forkedend at a the lower serrated jaw B, as shown. Above the pivot to ispivoted to the upper end of the handle A at c c the preferably curvedlinks 0 O, which are pivoted in their outer ends at 0' to the outer orupper jaw D, as shown in the drawings.

1) and dare central ribs or extensions on the respective jaws B and D,which ribs are pivoted or otherwise linked or connected to- 3 5 getherat 6 between the fulcra c and c, as

shown in the drawings. It will thus be noticed that the lower jaw Bturns on the handle-fulcrum a, and is rocked by its connection to theupper jaw D.

The upper jaw D has two motionsimparted to it, namely: First, it isrocked on the fulcrum c, where it is pivoted to the links 0 O, and it isthus rocked by its connection to the lower jaw B; secondly, the saidupper jaw D swings with the links C C on the fulcra c c,

where said links are pivoted to thehandle A, and by this constructionand arrangement of parts a most powerful grip is obtained when the jawsare closed on a pipe P or similar ob ject and the handle A swung in thedirection as shown by the arrow in Fig. 1.

In using the wrench the jaws are expanded, as shown in Fig. 2, which maysimply be done by taking hold of the upper jaw D and swinging it upward,as shown in Fig. 2. The pipe or other object to be turned is thenintroduced between the jaws and the latter closed by hand against thesaid pipe or object, after which the handle A is turned in the directionof the arrow shown in Fig. 1, causing the jaws to grasp and hold thepipe with a pressure increasing in a ratio to the power exerted on thehandle. The wrench can instantly be disengaged from the pipe by swingingthe handle A in a direction opposite to that indicated by the arrow inFig. 1.

What I wish to secure by Letters Patent, and claim, is-

1. The herein-described wrench, consisting of a handle, alower jawpivoted to it, and an upper jaw hung to linkspivoted to said handle,said jaws having their inner ends hinged or connected together,substantially as and for the purpose set forth.

2. The herein-described wrench, consisting of a handle, a lower jawpivoted to it, links pivoted to said handle on fulcra above thelower-jaw fulcrum,and an upper jaw pivoted to said links and connectedor pivoted to the lower jaw, substantially as and for the pur- So poseset forth.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, on this 18th day of September, A.D. 1890.

GEORGE F. SHAW.

Witnesses:

ALBAN ANDREN,

Amen A. PERKINS.

